An atom of the element erbium is shown as $^{167}_{68}\text{Er}$. Which row gives the numbers of protons, neutrons and electrons in this atom?
- Aprotons: 68, neutrons: 99, electrons: 68
- Bprotons: 68, neutrons: 99, electrons: 99
- Cprotons: 99, neutrons: 68, electrons: 68
- Dprotons: 99, neutrons: 68, electrons: 99